Run a command prompt as administrator and type powercfg /batteryreport to see the full charge capacity vs. design capacity . Aim for above 80-85% health .
If buying in person, ask to see the laptop out of the box before finalized payment. buying open box laptop
Use a solid black and solid white background to spot dead pixels, bright spots, or flickering. Run a command prompt as administrator and type
Check for dents, deep scratches, or cracks, especially at the corners and hinges . or flickering. Check for dents
Plug in the charger to ensure it's recognized, and test every USB and HDMI port. Where to Buy
Open a text editor and type on every single key to ensure none are sticky or non-functional.